So, your wife has access to your 1Password database at any time. As does anyone else who has (or should gain) access to this safe…

That's a major security risk. If I were to implement this, there'd have to be a stronger barrier to perusal than a shared safe. I'm not going to think about it right now, but I'd suggest the document be held in a place (or by a person) that allows access to the information only when certain circumstances have already come to pass.

All for preparing for the future - but without compromising the initially-sought security. *grin*